Acid-proof refractory composition



l06. COMPOSITIONS,

comma R PLASTIC UNITED. STATES Cross Reference PATENT OFFICE.

P. BLSSET'I, OF OYN'IHIANA, KENTUCKY ACID-PROOF REFRACTORY COIPOSI'IION.

139032 7. I0 Drawing.

To all whom it may concern:

Be it known that I, HARRY P. Bassa'rr, a citizen of the United States,residing at Cynthiana in the county of Harrison and State of kentucky,have invented certain new and useful Improvements in Acid-ProofRefractory Compositions, of whim lowing is a specification.

This invention relates to acid proof refractory compositions andparticularly to acid roof refractory bricks, cements and plastic iningsfor furnaces and the like.

Numerous attempts have been made to provide compositions of thischaracter which would be inexpensive to manufacture, capable ofwithstanding a high temperature and not subject to the disadvantage thatwhen formed into bricks will become warped, or distorted when subjectedto the process of burning or when put into use.

Now, I have discovered that by the use of sand, n the metallic sta in te form of compound as, for example, sodium silicate or sodi im mmte, anda silicate binder such as ort and cement, infusorial earth or pottersclay, I am able to produce acid proo refractory material suitableforlining furnaces and the like which contains a higher content ofsilica than prior compositions and able to withstand higher temperatureswithout injury therefrom and which, when formed into bricks, can beburned and used without warping, fusing out of shape or sustaining otherlike injury.

A satisfactory composition embodying my invention comprises thefollowing materials in the following proportions by weight:

Sand 100 to 120 parts Iron oxid 5 parts Sodium silicate--- 4 partsPortland cement- 5 parts This material is suitable for being formed intobricks or for use as a wet or a dry cement in the usual manner, as willbe understood by those skilled in this art. Where the material is to beused in the form of bricks, however, I may advantageously add 5 parts byweight of infusorial earth thereto. Where it is to be used as a wet or adry cement, I prefer to uselO parts b weight of potters clay in additionto the ortland ceme ,lpeclflcation of Letters raunt. Patented Sept. 13,1921.

- pplicatibn filed October 15, 1919. Serial No. 830,904 M Where thematerial i formed into ricks,

I prefer toadd thereto before forming and burning, from about 25 to 35per cent. by weight of crushed brick made from the same com ositiomdksare formed and Burned 1n the usual way, the temperature at which theyare burned being preferably from about 2000 F. to 3000 F. I An impor avan ag my improved compositlon, particularly where it is used in theform of bricks, results from the use of a luralit of binders which aresuccessively e ective t roughout difierent ranges of temperatures fromordinary a ospheric temperatures to 3000 F. or above to hold thecomposition in a set or substantially rigid form, whereby warping,distortion or analogous injury is prevented. For example, the ortlandcement or potters clay is effective as a binder to hold the compositionfirmly in shape from ordinary atmospheric temperatures to a red heat orabove. The silicon in combination with the alkali metal present iseffective as a binder from a red heat to I800 F, orsomewhat above andthe compound of iron and silicon is effective as a f binder to maintainthe set of the composition frpm 1800 F. to 3000 F. and above; in fact,to the highest temperature to which furnace linings are subjected, suchiron and silicon compound becoming progressively harder as the heat towhich the material is subjected is raised above 1800 F..

. Another important advantage of my improved composition is that byreason of the use of the materials employed with the sand, I am able toprovide a satisfactory acid proof refractory composition containing avery small proportion of 'cementitious material, whereby my compositionis more durable and and rehable in use and capable of being subjected toa higher temperature without fusion or disintegration.

I have found that instead of using iron or an iron compound, I mayemploy any metal of the iron or aluminumgroups or compound thereof,notably aluminum, titanium, chromium, zirconium or un en their com oundsand metals compriseo within the iron and aluminum groups are, therefore,to be considered as equivalents of 10 5 iron for use in my improvedcomposition.

While I have described detail the preferred form of my composition, thepreferred Examinl met od ofproduction, it is to be understood that myinvention is not strictly limited thereto except as set forth in thesubjoined claims.

Having thus described my invention, I

to 3000 F.

3. The herein described acid roof refractory composition comprising s1ica, a metal comprise within the iron and aluminum groups, an alkalimetal compound and a silicate binder.

4. The herein described acid proof refractory composition com risingsand, iron, an alkali metal compoun and a silicate binder.

5. The herein described acid proof refractory composition comprisingsand, iron, sodium silicate, and a silicateadapted to act as a binderfor the composition at temperatures below a red heat.

6. The herein described acid roof refractory composition comprising si'ca, iron, so-

proplortions of ingredients and the preferred dium silicate, Portlandcement, and infusorial earth.

7. The herein described acid proof refractory composition comprisingapproximatel from 100 to 120 parts b weight of san about 5 parts byweight 0 iron oxid, about 4 parts by weight of sodium silicate, andabout 5 parts by weight of Portland cement.

8. The herein described acid proof refractory composition comprisingapproximatel from 100 to 120 parts b weight of san about 5 parts byweight 0 iron oxid, about 4 parts by wei htof sodium silicate, about 5parts by weight of Portland cement, and about 5 parts by weight ofinfusorial earth.

9. The herein described acid proof refractory brick'comprising sand, apluralit of binders effective to maintain the set of such compositionsuccessively throughout difi'erent rangesof temperature, from ordinaryatmospheric temperatures to 3000 F. and approxlmately from 25 to 35 percent. by weight of crushed brick made from the same composition.

, 10. The herein described acid roof refractory composition com risin siica, iron, an alkali metal compoun a si icate binder, and approximatelyfrom 25 to 35 "per cent. by weight of crushed brick made from the samecomposition.

In testimon whereof I afiix my signature in presence 0 two witnesses.

HARRY P. BASSETT.

Witnesses:

MARY F. LYONS, CURTIS C. MEIGB.

